LM431AIMX [FAIRCHILD]
Programmable Shunt Regulator; 可编程并联稳压器
| 型号： | LM431AIMX |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Programmable Shunt Regulator |
| 文件： | 总11页 (文件大小：230K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 2013
LM431A / LM431B / LM431C
Programmable Shunt Regulator
Features
Description
• Programmable Output Voltage to 36 V
• Low Dynamic Output Impedance: 0.2 Ω (Typical)
• Sink Current Capability: 1.0 to 100 mA
• Equivalent Full-Range Temperature Coefficient of
50 ppm/°C (Typical)
The LM431A / LM431B / LM431C are three-terminal out-
put adjustable regulators with thermal stability over the
full operating temperature range. The output voltage can
be set to any value between VREF (approximately 2.5 V)
and 36 V with two external resistors. These devices have
a typical dynamic output impedance of 0.2 Ω. Active out-
put circuit provides a sharp turn-on characteristic, mak-
ing these devices excellent replacements for Zener
diodes in many applications.
• Temperature Compensated for Operation Over Full
Rated Operating Temperature Range
• Low Output Noise Voltage
• Fast Turn-on Response
TO-92
1
1. Ref 2. Anode 3. Cathode
8-SOIC
1
1.Cathode 2.3.6.7.Anode
4.5.NC 8.Ref
Ordering Information
Operating
Temperature
Range
OutputVoltage
Part Number
Top Mark
Package
Packing Method
Tolerance
LM431CCZ
LM431CCMX
LM431BCZX
LM431BCZXA
LM431BCMX
LM431ACZ
LM431CCZ
LM431CCM
LM431BCZ
LM431BCZ
LM431BCM
LM431ACZ
LM431ACZ
LM431ACM
LM431CIM
LM431BIZ
LM431AIZ
LM431AIM
TO-92
8-SOIC
TO-92
TO-92
8-SOIC
TO-92
TO-92
8-SOIC
8-SOIC
TO-92
TO-92
8-SOIC
Bulk
0.5%
Tape and Reel
Tape and Reel
Ammo
1%
2%
-25 ~ +85°C
Tape and Reel
Bulk
LM431ACZX
LM431ACMX
LM431CIMX
LM431BIZX
LM431AIZ
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Bulk
0.5%
1%
-40 ~ +85°C
2%
LM431AIMX
Tape and Reel
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
1
Block Diagram
CATHODE
REFERENCE
+
-
2.5 Ref
ANODE
CATHODE (K)
REFERENCE (R)
ANODE (A)
Figure 1. Block Diagram
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.
Symbol
VKA
Parameter
Value
37
Unit
V
Cathode Voltage
IKA
Cathode Current Range (Continuous)
Reference Input Current Range
-100 ~ +150
-0.05 ~ +10
mA
mA
IREF
Power Dissipation
TO-92, 8-SOIC Packages
PD
770
160
mW
Thermal Resistance, Junction to Ambient
TO-92, 8-SOIC Packages
RθjA
°C/W
Operating Temperature Range LM431xC
Operating Temperature Range LM431xI
Junction Temperature
-25 ~ +85
-40 ~ +85
150
°C
°C
°C
°C
TOPR
TJ
TSTG
Storage Temperature Range
-65 ~ +150
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
VKA
Parameter
Min.
VRef
1.0
Max.
36
Unit
V
Cathode Voltage
Cathode Current
IKA
100
mA
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
2
Electrical Characteristics
Values are at TA = 25°C unless otherwise noted.
LM431A
LM431B
LM431C
Symbol Parameter
Conditions
VKA = VREF
Unit
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
Reference
VREF
,
2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508
V
Input Voltage IKA = 10 mA
Deviation of
Reference
InputVoltage IKA =10 mA
Over-
Temperature
VKA = VREF,
ΔVREF
ΔT
/
/
4.5 17.0
-1.0 -2.7
4.5 17.0
-1.0 -2.7
4.5 17.0
-1.0 -2.7
mV
(1)
TMIN ≤ TA ≤ TMAX
Ratio of
Change in
Reference
Input Voltage IKA =
ΔVKA
10V-VREF
=
ΔVREF
ΔVKA
mV / V
to the
10 mA
ΔVKA
=
-0.5 -2.0
-0.5 -2.0
-0.5 -2.0
Change in
Cathode
Voltage
36V-10V
Reference
Input Current R1 =10 kΩ, R2 = ∞
IKA = 10 mA,
IREF
1.5
0.4
4.0
1.2
1.5
0.4
4.0
1.2
1.5
0.4
4.0
1.2
μA
μA
mA
Deviation of
Reference
IKA = 10 mA,
Input Current
R1 = 10 kΩ, R2 = ∞
Over Full
ΔIREF
ΔT
/
TA = Full Range
Temperature
Range
Minimum
Cathode
Cur-rent for
IKA(MIN)
VKA = VREF
0.45 1.00
0.45 1.00
0.45 1.00
Regulation
Off - Stage
VKA = 36 V,
IKA(OFF) Cathode
Current
0.05 1.00
0.15 0.50
0.05 1.00
0.15 0.50
0.05 1.00
0.15 0.50
μA
VREF = 0
Dynamic
VKA = VREF,
ZKA
Note:
Impedance
IKA =1 to 100 mA
Ω
f ≥ 1.0 kHz
1. LM431xC: TMIN = -25°C, TMAX = +85°C.
LM431xI: TMIN = -40°C, TMAX = +85°C.
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
3
Test Circuits
LM431
LM431
Figure 3. Test Circuit for VKA ≥ VREF
Figure 2. Test Circuit for VKA= VREF
LM431
Figure 4. Test Circuit for IKA(OFF)
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
4
Typical Performance Characteristics
Figure 5. Cathode Current vs. Cathode Voltage
Figure 6. Cathode Current vs. Cathode Voltage
Figure 7. Change In Reference Input Voltage vs.
Cathode Voltage
Figure 8. Dynamic Impedance Frequency
Figure 9. Small Signal Voltage Amplification vs.
Frequency
Figure 10. Pulse Response
© 2003 Fairchild Semiconductor Corporation
www.fairchildsemi.com
LM431A / LM431B / LM431C Rev. 1.2.0
5
Typical Performance Characteristics (Continued)
140
A
B
A VKA = Vref
120
100
80
60
40
20
0
B VKA = 5.0 V @ IK = 10mA
C VKA = 10 V @ IK = 10mA
D VKA = 15 V @ IK = 10mA
TA = 25oC
C
D
100p
1n
10n
100n
1?
10?
CL, LOAD CAPACITANCE
Figure11. Stability Boundary Conditions
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
6
Typical Application
R
R
R
1
1
1
V
= V
1 + -------
V
=
1 + ------- V
V
=
1 + ------- V
ref
O
ref
O
ref
R
2
O
R
R
2
2
LM431
LM431
LM431
Figure 12. Shunt Regulator
Figure 13. Output Control for Three-
Terminal Fixed Regulator
Figure 14. High-Current Shunt
Regulator
LM431
LM431
Figure 15. Current Limit or Current Source
Figure 16. Constant-Current Sink
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
7
Physical Dimensions
TO-92 Bulk Type
D)
DRAWING FILENAME: MKT-ZA03DREV3.
Figure 17. 3-Lead, TO-92, Molded, Standard Straight Lead
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
8
Physical Dimensions (Continued)
TO-92 Ammo Type, Tape and Reel Type
D) DRAWING FILENAME: MKT-ZA03FREV2.
Figure 18. 3-Lead, TO-92, Molded, 0.200 in Line Spacing Lead Form
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
For current tape and reel specifications, visit Fairchild Semiconductor’s online packaging area:
http://www.fairchildsemi.com/products/discrete/pdf/to92_tr.pdf.
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
9
Physical Dimensions (Continued)
8-SOIC
5.00
4.80
A
0.65
3.81
8
5
B
1.75
6.20
5.80
4.00
3.80
5.60
1
4
PIN ONE
INDICATOR
1.27
1.27
(0.33)
0.25
C B A
LAND PATTERN RECOMMENDATION
SEE DETAIL A
0.25
0.10
0.25
0.19
C
1.75 MAX
0.10
0.51
0.33
OPTION A - BEVEL EDGE
0.50
x 45°
GAGE PLANE
0.25
R0.10
R0.10
OPTION B - NO BEVEL EDGE
0.36
NOTES: UNLESS OTHERWISE SPECIFIED
8°
0°
0.90
0.40
A) THIS PACKAGE CONFORMS TO JEDEC
MS-012, VARIATION AA.
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS DO NOT INCLUDE MOLD
FLASH OR BURRS.
D) LANDPATTERN STANDARD: SOIC127P600X175-8M.
E) DRAWING FILENAME: M08Arev14
F) FAIRCHILD SEMICONDUCTOR.
SEATING PLANE
(1.04)
DETAIL A
SCALE: 2:1
Figure 19. 8-Lead, SOIC, JEDEC MS 0-12, 0.150 inch Narrow Body
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
For current tape and reel specifications, visit Fairchild Semiconductor’s online packaging area:
http://www.fairchildsemi.com/products/discrete/pdf/soic8_tr.pdf.
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
10
TRADEMARKS
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intended to be an exhaustive list of all such trademarks.
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2Cool¥
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®*
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Build it Now¥
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CROSSVOLT¥
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FRFET®
PowerTrench®
PowerXS™
Programmable Active Droop¥
QFET®
Global Power ResourceSM
GreenBridge¥
Green FPS¥
Green FPS¥ e-Series¥
Gmax¥
TinyBoost¥
TinyBuck¥
TinyCalc¥
TinyLogic®
TINYOPTO¥
TinyPower¥
TinyPWM¥
TinyWire¥
TranSiC¥
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Quiet Series¥
RapidConfigure¥
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GTO¥
IntelliMAX¥
Current Transfer Logic¥
DEUXPEED®
Dual Cool™
EcoSPARK®
EfficientMax¥
ISOPLANAR¥
Making Small Speakers Sound Louder
and Better™
Saving our world, 1mW/W/kW at a time™
SignalWise¥
SmartMax¥
TriFault Detect¥
TRUECURRENT®*
PSerDes¥
MegaBuck¥
SMART START¥
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®
MicroPak¥
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Ultra FRFET¥
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mWSaver¥
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SuperSOT¥-8
OptoHiT¥
SupreMOS®
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OPTOLOGIC®
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SyncFET¥
* Trademarks of System General Corporation, used under license by Fairchild Semiconductor.
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FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE
RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT
OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE
SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN,
WHICH COVERS THESE PRODUCTS.
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FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE
EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems which, (a) are
intended for surgical implant into the body or (b) support or sustain
life, and (c) whose failure to perform when properly used in
accordance with instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the user.
2. A critical component in any component of a life support, device, or
system whose failure to perform can be reasonably expected to
cause the failure of the life support device or system, or to affect its
safety or effectiveness.
ANTI-COUNTERFEITING POLICY
Fairchild Semiconductor Corporation's Anti-Counterfeiting Policy. Fairchild's Anti-Counterfeiting Policy is also stated on our external website, www.fairchildsemi.com,
under Sales Support.
Counterfeiting of semiconductor parts is a growing problem in the industry. All manufacturers of semiconductor products are experiencing counterfeiting of their
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PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
Datasheet contains the design specifications for product development. Specifications may change
in any manner without notice.
Advance Information
Formative / In Design
Datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild
Semiconductor reserves the right to make changes at any time without notice to improve design.
Datasheet contains final specifications. Fairchild Semiconductor reserves the right to make
changes at any time without notice to improve the design.
Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor.
The datasheet is for reference information only.
Preliminary
No Identification Needed
Obsolete
First Production
Full Production
Not In Production
Rev. I64
© Fairchild Semiconductor Corporation
www.fairchildsemi.com
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